28193857 has 2 divisors, whose sum is σ = 28193858. Its totient is φ = 28193856.

The previous prime is 28193833. The next prime is 28193927. The reversal of 28193857 is 75839182.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22619536 + 5574321 = 4756^2 + 2361^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28193857 is a prime.

It is a super-3 number, since 3×28193857³ (a number of 23 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (28193657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14096928 + 14096929.

It is an arithmetic number, because the mean of its divisors is an integer number (14096929).

Almost surely, 2^28193857 is an apocalyptic number.

It is an amenable number.

28193857 is a deficient number, since it is larger than the sum of its proper divisors (1).

28193857 is an equidigital number, since it uses as much as digits as its factorization.

28193857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 120960, while the sum is 43.

The square root of 28193857 is about 5309.7887905264. The cubic root of 28193857 is about 304.3580765903.

The spelling of 28193857 in words is "twenty-eight million, one hundred ninety-three thousand, eight hundred fifty-seven".